A flea stands on the end of a 1.0 cm long sweep second hand of a clock that rests
horizontally on a table. What is the minimum
coefficient of static friction which would
allow the flea to stay there without slipping?
Include an appropriate free-body diagram.

Answerboth technicians (a) and (b);

Year  1936,  lehman predicted that the earths 'inner core' is solid. she observed that the seismic signals during her study were bent and did not pass through instead bouncing back. later it was confirmed that the earth's inner core was solid made up of nickel-iron and had a molten outer core.